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Old 10-02-2012, 07:35 PM   #1
poppalarge
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I've seen some people measuring the gravity of their wort with some kind of microscope device.

What is such a thing called?

 
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Old 10-02-2012, 07:36 PM   #2
DeafSmith
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Maybe you are referring to a refractometer ?

Like this one

http://www.austinhomebrew.com/produc...oducts_id=1014

 
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Old 10-02-2012, 07:37 PM   #3
RC0032
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Like this?



Refractometer ~$100

 
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Old 10-02-2012, 07:38 PM   #4
poppalarge
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That's the one.


How does it work?

 
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Old 10-02-2012, 07:42 PM   #5
RC0032
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Very nicely!!

 
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Old 10-02-2012, 07:43 PM   #6
poppalarge
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Sold!

 
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Old 10-02-2012, 07:46 PM   #7
menerdari
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I paid $30 for mine on Amazon, works flawlessly

 
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Old 10-02-2012, 07:50 PM   #8
Unibrow
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Mine was $40 on Amazon I think - works very well and helps because you only need a few drops of wort for the OG reading
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Old 10-02-2012, 07:52 PM   #9
gr8shandini
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Quote:
Originally Posted by poppalarge View Post
That's the one.


How does it work?
A refractometer measures the sugar content of the wort by measuring how far light bends (or refracts) when as it passes through. You can only take direct measurements prior to fermentation, though. Once you have alcohol in the mix, you need to use a formula to correct the readings. Since you're unlikely to miss your OG when extract brewing, you're better off just using your hydrometer. However, they come in really handy when/if you go all-grain since you'll want to take multiple samples of hot wort, and the few drops you'll need will cool really quickly.

By the way, if you search ebay, you can find them for much less than $100. More like 30 bucks. Just make sure you get one with Automatic Temperature Correction (ATC) as they don't cost much more and it's one less calibration you have to keep track of.

 
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Old 10-02-2012, 07:54 PM   #10
menerdari
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I should have mentioned, you have to have an accurate O.G. reading to get a reading after fermentation because a refractometer can't measure alcohol.
There are online calculators that you plug in the original reading and current reading (in brix) and it will spit out the current gravity reading.

 
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